The C16F6TM080 is a Schneider Electric ComPacT NSX160F moulded-case circuit breaker (MCCB) with a 4-pole (4P) configuration and a thermal-magnetic TM-D trip unit rated at 80 A at 40 °C. This is the device that sits between your transformer and the distribution bus in a panel — it provides overload (L) and short-circuit (I) protection for cable and load circuits per EN/IEC 60947-2. The headline breaking capacity is 85 kA Icu at 240 V AC, but for a 400 V class panel the relevant figure is 36 kA Icu at 380/415 V AC. That 36 kA at 415 V determines whether this breaker coordinates with the upstream transformer or downstream branch breakers — it is the number you need for your selective coordination study, not the 85 kA figure.
The front-to-front connection pitch is 35 mm, and both upside and downside connections are front-access — no rear bus work required.
Mechanical durability is 40,000 cycles. Electrical durability varies with load: 40,000 cycles at 440 V at half rated current (In/2), 20,000 cycles at 440 V at full rated current (In), and 7,500 cycles at 690 V at In. For a distribution breaker that sees infrequent switching (a few operations per month), this is well into the 'fit and forget' range. For a breaker that is switched daily as a disconnect, the 20,000-cycle figure at 440 V In is the one to watch.